I looked up the Glen Elg tartan and it looks like this.


It's really hard to compare the two, because the swatch that you posted is not only faded a bunch, but I can't see the whole plaid to compare the lines. It kind of reminded me of a faded County Cavan Tartan, but I looked that up too, and it's just too hard to tell. I'll keep my eye out for you, but if you have a better picture of it, it would greatly help. Take a picture of you in the kilt, or lay the kilt on the bed, and take a picture.

Good luck!